Abstract
Based on a multichannel incoherent optical correlator, a new simple scheme is proposed for performing a complex discrete Fourier transform. A complex value is represented by using three nonnegative reals, and every real is encoded with the area of a rectangular aperture. A 3 N×3 N-element kernel mask together with a 3 N-element 1D-pin-hole-array illuminated with an extended source is used to calculate an 1D-DFT of an N-point input. Some properties of DFT are demonstrated in experiments.
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